Cisco Switching/Routing :: Configuring Port To 6901 VoIP Phone?
May 2, 2013
We've been configuring our swtichports as follows for our 7945 and 6941 type VoIP Phones, but are having problems witht the 6901.
VLANS
Vlan 900 is a VoIP VLAN
Vlan 999 is a NULL VLAN and is shut down:
interface g0/1
switchport access vlan 999 {VLAN to direct data traffic to the bit bucket becuase a PC shouldn't be connected to this port}
switchport mode access
switchport voice vlan 900
mls qos trust cos
spanning-tree portfast
The 6901 phone doesn't support multiple VLANs, so our configuration above does not work unless vlan 999 is turned on (not good security wise). We got the phones to work also by removing vlan 999 and switchport mode access.
switchport voice vlan 900
mls qos trust cos
spanning-tree portfast
solution that provides the discarding of data for the access VLAN, while supporting the VoIP vlan for this phone?
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May 14, 2013
im having this strange issue where everytime i plug in a voip phone to my 3550 the switch disconnects another voip phone.then to fix the disconnected phone (7940) i need to power off the phone 5-10 minutes then power it on again.
but the strange thing is, once i have to do that to fix the phone and connect the phone back to the switch, the port link is up, but no macs are seen on that port.
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Jan 15, 2013
We just installed a hosted VOIP system using Cisco 7900 series IP phones. We are having a strange issue with a few computers where they pull DHCP information from our VOIP provider's DHCP server on the Internet and not our LAN DHCP server.
The switchports areconfigured as: switchport mode access
My rationale behind this is that the phones would use CDP to get their VLAN info from the providers Cisco router and the PCs would just ride on the default VLAN. But this is not the case. Computers randomly keep getting DHCP info from the provider's router. Do I have to use voice vlan x and make the switchports trunks?
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Sep 15, 2011
I have a 4510R-E chassis with SUP7-E running IOS XE version 3.01.01.SG. I am unable to create a port-channel and apply auto-qos for VOIP.If I configure auto-qos on the physical interfaces, I get this message when I try adding them to the port channel:
"The attached policymap is not suitable for member either due to non-queuing actions or due to type of classmap filters."
Auto-qos is not an available command in the port-channel interface configuration, but if I try adding the service policies that were created by auto-qos to the port channel manually, it lets me apply the input policy but on the output policy I get this message:
"A service-policy with queuing actions can be attached in output direction only on physical ports."
With the input policy applied to the port-channel interface, I tried addign the output policy to the physical ports and I got this message:
"A service-policy with non-queuing actions should be attached to the port-channel associated with this physical port."
Is there a way to get the auot-qos policies applied to the port-channel properly?
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May 25, 2012
I currently have a Cisco 891 running with a FTP running on port 21. I currently have the NAT from external IP to and internal IP 192.168.12.6 for port 21. And the firewall allowing that traffic through and client software is working fine. However I need this FTP to be running on port 990 and anytime I change the NAT and the firewall, the external FTP clients connect but then drop when recieving the directory listing.
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Jan 31, 2012
I have a 3560 8 port switch. Int gi0/9 is trunked to another switch downstream. When I try to configure int gi0/10 to trunk to a switch upstream the interface on the switch goes down and I have to either reboot the switch or plug directly into the switch and telnet into it to turn off trunking on the interface. When I configure trunking on the interface on the upstream switch that connects to this interface the same happens on that switch. The upstream switch is a 3750 with 12 sfp ports. Several interfaces are trunking to other switches from this switch. Spanning tree is not configured on the 3750 at all , and is not configured on either gi0/10 or gi0/9 on the 3560. I was consoled into the 3560 during a reboot after the interface went down, a message came up that said something like "Spanning Tree returning gigabit ethernet 10 to constant state" Why would I get this message if spanning tree is not enabled on the gig ports on either end of the trunk? There is no loop to require spanning tree to shut down an interface. I have several other 3560's configured as I would like to configure this switch and they are trunking without issue.
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Jul 11, 2012
Is it posible to config port forwarding on cisco 2950 or other switchs.if such a option is there ple let me know ho to config port forwarding on cisco 2950 switch..
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May 29, 2013
Since Avaya phones do not run CDP, how does the phone know which DHCP pool to pull from to get its IP address if the PC is connected to the phone.
Let's say I have a interface config like this
interface gigabitethernet1/0/1
cisco3750(config-if)#switchport mode trunk
cisco3750(config-if)#switchport access vlan 126
[code]....
And two DHCP scopes configured on the switch. What keeps the phone from pulling from the wrong scope?
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Mar 2, 2012
I have two servers, connected on two(Different) 6513 directly connected switches. Both these servers are in the same Vlan.
I have to monitor communication these two servers. I have a system connected on one of the 6513 switch, where network tool wireshark is installed.
How to configure span port.
switch 6513-1# show run int Gi10/43 --------------------Server 1 is connected
switch 6513-2# show run int Gi9/45 ------------------------Server 2 is connected
switch 6513-2# show run int Gi9/46 ------------------------System on which network tool wireshark is installed.
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Apr 11, 2012
I would like to configure a 3750 switch port to be able to use two vlans. I know you can do this with a voice and data vlan, but what about two data vlans ? Say I have two devices, one on a 10 subnet and the other on a 172 subnet, but i only have one wall jack for both devices to plug into. So I use a mini switch to connect both devices and connect the switch to the wall jack; and of course this all leads back to one switch port. When I go to enter the switchport access vlan 172 cmd, how would I also make it so the device on the 10 subnet could route out ?
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Oct 25, 2012
I'm new to networking and was looking for some assistance. First off im using packet tracer to diagram my senario as I will be receiving my equipment next week to deploy.
Hardware to be used:
1. 2 catalyst 3560 switches
2. all connect to a sonic wall router
I have two companies that work in the same office space. I need to keep these companies seperate on their own vlan. They will however need to share the phone system.(Packet tracer file uploaded to give those who have the time to see what I put together.) [code]
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Jul 1, 2012
Can you configure a Cisco 1941 to use an 8 port EHWic module and the 2 onboard GE ports in a single LAN?
I've discovered you can't have the on GE ports associated with a VLan, and I'm when I've previously researched for a solution, bridging was mentioned but I cannot seem to get it to work (or completely understand it)The reason I would like to use all 10 ports on for the LAN is becuase I have 10 devices I need to connect to the 1941?
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Feb 10, 2011
Recently at my company we have started using Polycom i335 IP Phones from 8x8 inc, the thing is that while trying to use it directly through a switch it does not register with the server and I get a "url call is disabled" msg on the LCD of the Polycom. On that same switch I am using an Aastra 6755i IP phone, it is working absolutely fine, although it is using the same technology and ports.Now if I connect my laptop via wireless or if I connect a PC through wire and use ICS to share the internet and connect the Polycom to the shared Ethernet port, the Polycom works fine! On the same network Vonage works fine as well. but this Polycom only and only works via ICS?
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Aug 5, 2011
Any VoIP box which has from 3 to 10 phone ports?I'm sourcing the box for a business that wants to connect about 8 phones to the box, then have the calls terminated on our partitioned platform hosted by a third party.
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Aug 14, 2012
I've recently set up a PC-based IP PBX in our small business which uses a SIP Trunk for up to 3 simultaneous voice calls. Ports needed to operate include 5060 (SIP-UDP) and then a huge range of high-number UDP ports which I believe is for the 'media' or audio. Let's call the range UDP 49,152 to 64,512. I only know a little about the SIP protocol but my understanding is that each call will randomly use a few ports from this range across which will pass audio, Is there a need to have such a wide range of ports open? If my SIP trunk is only capable of 3 simultaneous calls then it seems only 9 or so of those open ports could get used at once. Could I not just open, say a range of 100 ports and be fine, thereby reducing the security risk?
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Mar 14, 2013
Is it possible to connect an analog phone to an FXS port on a CME router and a VoIP phone to a switch connected to said router and have voice connectivity between the phones? Also, is it possible to connect an FXO port on that same CME to a RJ-11 wall jack to connect to the PSTN and be able to call that VoIP phone as well as the analog phone from my cellphone? I'm trying to tie as I read the CCNA Voice OCG.
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Dec 22, 2012
My cable provider has installed a separate RCA DHG536 modem for my VoIP phone service alongside my SB5120 modem, and charges me $7 a month modem rental. I am upgrading the SB5120 to a DOC 3.0 modem and wonder if I can abandon the DHG536 modem?
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Mar 26, 2012
We just purchased cisco 2960 for our VoIP needs and we are using polycom phones, and Phone and Computer will use same port. Since Polycom phones are capable working with CDP protocol and we are hoping to get another switch to expand VoIP network. I found easiest way of setting up each port is as following (from the cisco tutorial)
Switch#configure terminal
Switch(config)#mls qos
Switch(config)#interface fastethernet 0/1
Switch(config-if)#mls qos trust cos
Switch(config-if)#switchport voice vlan dot1p
Switch(config-if)#switchport voice vlan 10
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 20
Switch(config-if)#exit
My first question,when we are using switchport voice vlan dot1p ,I thought we instruct the switch port to use 802.1P priority tagging for voice traffic and to use the default native VLAN (VLAN 0) to carry all traffic.Do I still need to create a Vlan 20 for data and Vlan 10 for voice ?
Secondly,same tutorial adds these commands as well,Do you think for our set up, using those commands are feasible ?
Switch(config-if)#switchport priority extend trust
Switch(config-if)#priority-queue out
Switch(config-if)#spanning-tree portfast
Switch(config-if)#spanning-tree bpduguard enable
Switch(config-if)#exit
Thirdly,when we get another switch and do the same configuration for the second switch, can I use any port on Switch 1 as uplink without doing any configuration ?
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Mar 11, 2011
I have a VOIP WiFi phone (MIC505W) I have configure it according to the user manual.I get access to WiFi, but when I dial a number I get busy signal with the message "disconnet".
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Feb 26, 2011
I have recently been experiencing a problem. This started to occur after I had gotten new internet service and a new router. I now have comcast, and a new NetGear router. I also have a VOIP phone connected to the router call "AllVoi". Now, whenever I use this phone, all connections on WiFi go down as I am using it. While, when I am using any ethernet connections dirctly from the router, it works fine. It becomes a large problem when you are watching a video or something from a laptop WiFi connection.
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Nov 20, 2011
We have to set up voip for our network(for 50 phones not he cisco phones).
I need to just the route the voip traffic to gateway address of telephonic company(1.1.5.7) where they provide us the connectivity for the setination call.
What sort of protocols should i have to enable in pix i saw the concepts like sip, h323, ras, skinny.
We are using only voip for asa and no data or other traffic should be allowed.
inside adrees: 10.10.10.0/24 for all voip phones
outside:121.21.22.1
telephoneic gateway: 1.1.5.7
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Mar 1, 2013
I have the router for over two years, Present Firmware is V2.0.1.3, I have Polycom phone connected to the router using 8 x 8 VOIP service. The phone was working fine untill yesterday. 8 x 8 tech support suggested getting a different router. I have the same router at home and tried the same phone on my home router - it worked. So, the problem is not the phone but int he router. I tried to call Cisco tech support but found out that the warranty support expired and I need to buy a support plan. Called to buy the support, and gave up after an hours on hold. Left message.
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Sep 7, 2012
I have been experiencing drops in my wired internet connection and a google search brought me to your forums.It seems to disconnect more often either during a call on my voip phone (a snom) or shortly after - as if a surge of usage makes it drop out?
[code]...
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Apr 26, 2011
I am looking for a Best Practices or a few places to pay attention to in the Cisco ESW-520-48P switch I have. My VoIP solution is RingCentral, and while they are Cisco phones, I've been hestitant to setup VLANs etc. the way I am used to. Plus setting up Auto QoS seems different than what I am used to with a 3750 switch.
Right now I've left the Smartports Wizard alone, and none of the ports are configured. There are no VLANs or QoS on the LAN currently.
What I was running into were calls cutting out where one side wouldn't hear the other anymore, but the call would remain connected. However, this has happened in this small 15 person office, when there is only one employee here after hours, talking on the phone. There isn't any heavy network traffic, because I have network monitoring showing me low usage (no streaming music, videos, or anything else).
This switch has a Gb connection to a Linksys SR2024 (the server switch), which is also set at Factory Defaults. I mention that because I recently bypassed the ESW-520-48P, and plugged one phone into that switch and the RingCentral phone worked fine for outside calls.
Is there something besides QoS that I should look at in the ESW-520 switch that might be causing a checkpoint of some sort, or interrupting VoIP traffic that I need to configure or disable?
And are there any Best Practices or scenario guides for this switch? I found the Admin Guide, but it really just explains every option in the GUI for the switch. And it seems all of my CCNA training isn't working with going in and quickly troubleshooting this switch besides knowing that something in it could be hanging it up.
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Mar 11, 2010
We have 2mbps leased line and have Cisco 1841 which is managed by our ISP. I have hooked up another 1841 (please find basic config below, it will get more complex lateron) Now when I connect my laptop I am able to browse Internet. But when I conect VOIP phone, it is not able to contact it's Hosted Server on Internet.
VOIP phone is Polycom SoundPoint 550 and I get URL call disabed message. If I try netgear Firewall everything seems to work.that the voip provider needs following ports UDP Range 16384 - 32766, TCP 5060 & UDP 5060. But in my config all outbound traffic is allowed. [code]
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Oct 15, 2011
A broadband cable modem is connected to the input of a new BEFSR41 4-port router. The router feeds 4 computers (a newer "primary" PC, and 3 secondary "old goats" that I use to print online grocery coupons). The 4 PC's are networked to share a common printer, a single directory on the "primary" PC, and using a 4-port KVM switch - I switch a single keyboard and mouse to whichever PC that I am using at the time.
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Dec 15, 2011
How to set up RVS4000 QOS settings to work with a VOIP phone system? I need to get the QOS active on the VPN so that a remote office with VOIP phones can reach the PBX at the main office over the Internet connection.
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Sep 8, 2011
How do I configure E4200 for VOIP priority. My vonage adapter is connected to the router by Ethernet.Also I want google voice call prioritization.
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May 21, 2013
I have a Cisco SG 300-20 as the core switch, layer 3. It is 192.168.4.6 on VLAN1 and 192.168.5.1 for VLAN2 (VOIP). All the ports are set in trunk mode. DHCP relay is setup on this switch.
The phones connected into a layer 2, Catalyst 2960-S switch. All ports are set in trunk mode. Default gateway on it is set to 192.168.5.1.
DHCP for both VLANs is provided by a Windows Server 2008 R2 server (the relay IP 192.168.4.15).
There is also an ASA 5510 in the mix which is 192.168.4.1. It has a route added to it for the 192.168.5.0 network to go to the SG 300 (192.168.5.1).
Just the two switches can ping each other on the 192.168.5.x network when I "add vlan 2" to the trunk port that is connected between the SG 300 and the 2960. The phones don't get DHCP on the 2960 switch. And I cannot ping 192.168.5.x from the ASA or anything else on the 192.168.4.x network.
After a bit of reading on intra-vlan routing for the SG 300 switch, I am thinking the SG 300 has to be the "center" of things so I need to make it 192.168.4.1 to be the gateway for both VLANs and change the ASA to 192.168.4.2 for VLAN1, etc. And I really can't do asymmetric routing with this switch.
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Mar 25, 2012
I read some papers about QoS. The thing is that I have to implement 30 switches with QoS to connect to a lot of Cisco IP phones. The switches are Cisco 2960S with code image "C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(55)SE3". Should I use autoQoS feature or manually configure them?. How should I treat uplinks between access switchs and core/distribution? I have a lot of doubts regarding queueing, because all the info I had read its for another model/image.
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Dec 10, 2012
I'm looking to do a basic QOS configuration which states that VOIP traffic has priority over anything else.
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Dec 16, 2012
configure, or enable voice over ip (voip) on my router cisco 3825, I have Ip phone 7905G and 7960.
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Jun 20, 2012
try to configure QoS on a Cisco Small Business SG300 Switch. I followed the instruction on [URL] and configured one Port for tagging my Traffic from a Aastra IP Phone. Tagging works fine (i verified with wireshark).The problem is, that all traffic to a PC connected directly to the Aastra IP Phone is blocked. Is there a possibility to tag any other traffic to the port as a default?
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